Cadmium plating bath



Patented Nov. 24, 1931 UNITED STATES PATENT OFFICE CHAD H. HUMIPHRIES, OF INDIANAPOLIS. INDIANA, ASSIGNOR T JAMES C. PA'ITEN, OF INDIANAPOLIS, INDIANA; E. KIRK MCKINNEY SPECIAL ADMINISTRATOR OF SAID JAMES C. PATTEN, DECEASED CADMIUM ILA'IING BATH No Drawing.

The object of my invention is to secure a I bright homogeneous and coherent electrolytic plating of cadmium upon another metal.

I have discovered that the desired result may be accomplished by adding to an acid cadmium plating bath commercial barley sugar, cane sugar caramel or malt sugar or malt syrup.

.For instance in an acid plating bath having two and one-half ounces of cadmium oxide and six ounces of sulphuric acid per gal- 1011 of water one to ten grams of one of the sugars mentioned above will insure a fine lustrous, dense, homogeneous deposit of cadmium. A

The same is true in an acid bath containing two and one-half ounces'of cadmium oxide, six ounces of sul huric acid and four ounces of ammonium su phate per gallon of water.

Similar'baths can be produced by dissolving in water a dry mixture composed of two and one-half to three ounces of cadmium oxide, six ounces of acid sodium sulphate and four ounccs'of ammonium sulphate, or a mixture of four ounces of cadmium sulphate and six ounces of ammonium sulphate, per gallon of water.

WVhere the dry mixtures mentioned above are used in producing the bath, the desired quantity, one to ten grams, of the glucoside brightener may be preliminarily associated with the dry ingredients if desired.

I claim as my invention:

. 1. That improvement in the art of 'cadmium platingwhich involves the inclusion, in an appropriate bath containing cadmium oxide and sulphuric acid, in the approximate proportions of 2 ounces of cadmium oxide and 6 ounces of sulphuric acid per gallon of water, of 1 to 10 grams of commercial cane sugar caramel.

2. That improvement defined in claim 1 wherein the bath contains proportionately approximately 4 ounces of ammonium sulphate.

3. That improvement in the art of cadmium plating which involves the inclusion in an appropriate bath containing cadmium ox-.

ide and sulphuric acid'. in the approximate proportions of 2 ounces cadmium oxide Application filed April 4,4928. Serial No. 267,273.

and 6 ounces sulphuric acid per gallon of waapproximately 'ounces of ammonium sulphate.

7. That improvement in the art of cadmium plating which involves the inclusion in an appropriate bath containing cadmium oxide and sulphuric acid in the approximate proportions of 2 ounces cadmium oxide and 6 ounces sulphuric acid per gallon of water, of 1 to 10 grams of commercial malt sugar.

8. That im rovement defined in claim 7 wherein the 321th contains proportionately phate.

V In witness whereof, I, CHAD H. HUMPH: mas have hereunto set my hand at Indian apolis, Indiana, this 2nd day of April, A. D. one thousand nine hundred and twenty-ei ht.

CHAD H. HUMPHRIE approximately 4 ounces of ammonium sul-' 

